Out of curiosity, why get two 560's? For that price you could almost get a single 580.
Also, if you can get your hands on a 2600K instead of the 2700K, you'd save a few bills for the same chip. The 2700K is simply a multiplier bump from the 2600K, which is silly considering both are unlocked and very overclockable...
Do you require a micro-ATX board?